Get basic cursor updating going on

services/web/app/views/project/editor.jade

@@ -142,9 +142,11 @@ block content
 					font-size="settings.fontSize",
 					auto-complete="settings.autoComplete",
 					spell-check-language="project.spellCheckLanguage",
+					annotations="onlineUserCursorAnnotations[editor.open_doc_id]"
 					show-print-margin="false",
 					sharejs-doc="editor.sharejs_doc",
-					last-updated="editor.last_updated"
+					last-updated="editor.last_updated",
+					cursor-position="editor.cursorPosition"
 				)
 
 	//- #loadingScreen

services/web/public/coffee/app/ide.coffee

@@ -4,6 +4,7 @@ define [
 	"ide/connection/ConnectionManager"
 	"ide/editor/EditorManager"
 	"ide/settings/SettingsManager"
+	"ide/online-users/OnlineUsersManager"
 	"ide/directives/layout"
 	"ide/services/ide"
 	"directives/focus"
@@ -15,6 +16,7 @@ define [
 	ConnectionManager
 	EditorManager
 	SettingsManager
+	OnlineUsersManager
 ) ->
 	App.controller "IdeController", ["$scope", "$timeout", "ide", ($scope, $timeout, ide) ->
 		# Don't freak out if we're already in an apply callback
@@ -43,6 +45,7 @@ define [
 		ide.fileTreeManager = new FileTreeManager(ide, $scope)
 		ide.editorManager = new EditorManager(ide, $scope)
 		ide.settingsManager = new SettingsManager(ide, $scope)
+		ide.onlineUsersManager = new OnlineUsersManager(ide, $scope)
 	]
 
 	angular.bootstrap(document.body, ["SharelatexApp"])

services/web/public/coffee/app/ide/editor/EditorManager.coffee

@@ -9,6 +9,7 @@ define [
 				last_updated: null
 				open_doc_id: null
 				opening: true
+				cursorPosition: null
 			}
 
 			@$scope.$on "entity:selected", (event, entity) =>
@@ -32,8 +33,8 @@ define [
 
 		openDoc: (doc, options = {}) ->
 			console.log "Trying to open doc", doc.id
-			return if doc.id == @$scope.open_doc_id and !options.forceReopen
+			return if doc.id == @$scope.editor.open_doc_id and !options.forceReopen
-			@$scope.open_doc_id = doc.id
+			@$scope.editor.open_doc_id = doc.id
 			console.log "Actually opening doc", doc.id
 
 			$.localStorage "doc.open_id.#{@$scope.project_id}", doc.id

services/web/public/coffee/app/ide/editor/annotations/AnnotationsManager.coffee

@@ -0,0 +1,37 @@
+define [
+	"ace/range"
+], () ->
+	Range = require("ace/range").Range
+
+	class AnnotationsManager
+		constructor: (@$scope, @editor) ->
+			@markerIds = []
+
+			@$scope.$watch "annotations", (value) =>
+				if value?
+					@redrawAnnotations()
+
+		redrawAnnotations: () ->
+			console.log "REDRAWING ANNOTATIONS"
+			for marker_id in @markerIds
+				@editor.getSession().removeMarker(marker_id)
+			@markerIds = []
+
+			for annotation in @$scope.annotations or []
+				do (annotation) =>
+					console.log "DRAWING ANNOTATION", annotation
+					@markerIds.push @editor.getSession().addMarker new Range(
+						annotation.cursor.row, annotation.cursor.column,
+						annotation.cursor.row, annotation.cursor.column + 1
+					), "remote-cursor", (html, range, left, top, config) ->
+						div = """
+							<div
+								class='remote-cursor custom ace_start'
+								style='height: #{config.lineHeight}px; top:#{top}px; left:#{left}px;'
+							>
+								<div class="nubbin" style="bottom: #{config.lineHeight - 2}px"></div>
+								<div class="name" style="display: none; bottom: #{config.lineHeight - 2}px">#{$('<div/>').text(annotation.text).html()}</div>
+							</div>
+						"""
+						html.push div
+					, true

services/web/public/coffee/app/ide/editor/directives/aceEditor.coffee

@@ -4,11 +4,12 @@ define [
 	"ide/editor/undo/UndoManager"
 	"ide/editor/auto-complete/AutoCompleteManager"
 	"ide/editor/spell-check/SpellCheckManager"
+	"ide/editor/annotations/AnnotationsManager"
 	"ace/keyboard/vim"
 	"ace/keyboard/emacs"
 	"ace/mode/latex"
 	"ace/edit_session"
-], (App, Ace, UndoManager, AutoCompleteManager, SpellCheckManager) ->
+], (App, Ace, UndoManager, AutoCompleteManager, SpellCheckManager, AnnotationsManager) ->
 	LatexMode = require("ace/mode/latex").Mode
 	EditSession = require('ace/edit_session').EditSession
 
@@ -23,13 +24,25 @@ define [
 				sharejsDoc: "="
 				lastUpdated: "="
 				spellCheckLanguage: "="
+				cursorPosition: "="
+				annotations: "="
 			}
 			link: (scope, element, attrs) ->
+				# Don't freak out if we're already in an apply callback
+				scope.$originalApply = scope.$apply
+				scope.$apply = (fn = () ->) ->
+					phase = @$root.$$phase
+					if (phase == '$apply' || phase == '$digest')
+						fn()
+					else
+						@$originalApply(fn);
+
 				editor = Ace.edit(element.find(".ace-editor-body")[0])
 
 				autoCompleteManager = new AutoCompleteManager(scope, editor)
 				spellCheckManager = new SpellCheckManager(scope, editor, element)
 				undoManager = new UndoManager(scope, editor)
+				annotationsManagaer = new AnnotationsManager(scope, editor)
 
 				# Prevert Ctrl|Cmd-S from triggering save dialog
 				editor.commands.addCommand
@@ -41,6 +54,11 @@ define [
 				editor.commands.removeCommand "showSettingsMenu"
 				editor.commands.removeCommand "foldall"
 
+				editor.on "changeSelection", () ->
+					cursor = editor.getCursorPosition()
+					scope.$apply () ->
+						scope.cursorPosition = cursor
+
 				scope.$watch "theme", (value) ->
 					editor.setTheme("ace/theme/#{value}")
 

services/web/public/coffee/app/ide/online-users/OnlineUsersManager.coffee

@@ -0,0 +1,56 @@
+define [], () ->
+	class OnlineUsersManager
+		constructor: (@ide, @$scope) ->
+			@$scope.onlineUsers = {}
+			@$scope.onlineUserCursorAnnotations = {}
+
+			@$scope.$watch "editor.cursorPosition", (position) =>
+				console.log "CURSOR POSITION UPDATE", position
+				if position?
+					@sendCursorPositionUpdate()
+
+			@ide.socket.on "clientTracking.clientUpdated", (client) =>
+				console.log "REMOTE CURSOR POSITION UPDATE", client
+				if client.id != @ide.socket.socket.sessionid # Check it's not me!
+					@$scope.$apply () =>
+						@$scope.onlineUsers[client.id] = client
+						@updateCursorHighlights()
+
+			@ide.socket.on "clientTracking.clientDisconnected", (client_id) =>
+				@$scope.$apply () =>
+					delete @$scope.onlineUsers[client_id]
+					@updateCursorHighlights()
+
+		updateCursorHighlights: () ->
+			console.log "UPDATING CURSOR HIGHLIGHTS"
+			@$scope.onlineUserCursorAnnotations = {}
+			for client_id, client of @$scope.onlineUsers
+				doc_id = client.doc_id
+				@$scope.onlineUserCursorAnnotations[doc_id] ||= []
+				@$scope.onlineUserCursorAnnotations[doc_id].push {
+					text: client.name
+					cursor:
+						row: client.row
+						column: client.column
+				}
+
+		UPDATE_INTERVAL: 500
+		sendCursorPositionUpdate: () ->
+			if !@cursorUpdateTimeout?
+				console.log "CREATING DELAYED UPDATED"
+				@cursorUpdateTimeout = setTimeout ()=>
+					position = @$scope.editor.cursorPosition
+					doc_id   = @$scope.editor.open_doc_id
+
+					@ide.socket.emit "clientTracking.updatePosition", {
+						row: position.row
+						column: position.column
+						doc_id: doc_id
+					}
+
+					delete @cursorUpdateTimeout
+				, @UPDATE_INTERVAL
+			else
+				console.log "NOT UPDATING"
+					
+

services/web/public/stylesheets/app/editor.less

@@ -193,6 +193,28 @@
 		background-repeat: repeat-x;
 		background-position: bottom left;
 	}
+	@cursor-color: rgb(14, 158, 0);
+	.remote-cursor {
+		position: absolute;
+		z-index: 2;
+		border-left: 2px solid @cursor-color;
+		.name {
+			font-size: 0.8em;
+			background-color: @cursor-color;
+			color: white;
+			padding: 2px 6px;
+			border-radius: 3px 3px 3px 0;
+			position: absolute;
+			left: -4px;
+		}
+		.nubbin {
+			height: 6px;
+			width: 6px;
+			background-color: @cursor-color;
+			position: absolute;
+			left: -4px;
+		}
+	}
 }
 
 .ui-layout-resizer {